Human Reproduction — BIOLOGY STD 12 Science — Question

Zooplanktons enter a state of suspended development, called diapause, under unfavourable conditions. [True/ False]

Cyclosporin A is used for lowering the blood cholesterol level.

State True/ False with explanation.
Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/ defects in the female partner. (True/ False)

The skull of baby chimpanzee is more like the adult human skull than the skull of adult chimpanzee. True/ False

State whether the following are true or false:
The pyramid of energy is always inverted. It can never be upright.

The pioneer species always remain in equilibrium with the environment and do not change easily.

Write the two uses of PCR technique in diagnosis.

Mitotic cell divisions occur during embryogenesis.

Cannabinoids affect the digestive system. [True/ False]

Identify True/ False statements. Correct each false statement to make it true.
Androgens are produced by Sertoli cells. (True/ False)